[Bug 1213] ssh-keyscan exits in mid-way

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=1213

--- Comment #50 from Daniel Richard G. <skunk at iSKUNK.ORG> ---
Okay, tried again with your patch. Here's what I see:

    [...]
    # A.B.C.46 SSH-1.99-OpenSSH_4.2
    # A.B.C.47 SSH-1.99-OpenSSH_4.2
    # A.B.C.47 SSH-1.99-OpenSSH_4.2
    # A.B.C.47 SSH-1.99-OpenSSH_4.2
    # A.B.C.48 SSH-1.99-OpenSSH_4.2
    # A.B.C.48 SSH-1.99-OpenSSH_4.2
    # A.B.C.48 SSH-1.99-OpenSSH_4.2
    A.B.D.162: Connection closed by remote host
    # A.B.D.26 SSH-2.0-OpenSSH_5.8p2_hpn13v11 FreeBSD-20110503
    Connection closed by A.B.D.26

    (exit status 255)

I ran this at two different times of day, and got the same host in that
last "Connection closed" error. As the error is non-specific, here's
the backtrace:

    #0  0x00007ffff6802d50 in _exit () from /lib64/libc.so.6
    #1  0x00007ffff7fc2048 in cleanup_exit (i=255) at ../cleanup.c:31
    #2  0x00007ffff7f9fa99 in ssh_packet_read_seqnr
(ssh=0x7ffff86f4520,
        typep=0x7fffffffde0f "", seqnr_p=0x7fffffffde10) at
../packet.c:1330
    #3  0x00007ffff7fa69f5 in ssh_dispatch_run (ssh=0x7ffff86f4520,
mode=0,
        done=0x7ffff8207178, ctxt=0x7ffff86f4520) at ../dispatch.c:101
    #4  0x00007ffff7f85aef in keygrab_ssh2 (c=0x7ffff8207160)
        at ../ssh-keyscan.c:292
    #5  0x00007ffff7f86e99 in congreet (s=149) at ../ssh-keyscan.c:501
    #6  0x00007ffff7f86f34 in conread (s=149) at ../ssh-keyscan.c:516
    #7  0x00007ffff7f873b5 in conloop () at ../ssh-keyscan.c:587
    #8  0x00007ffff7f874cf in do_host (
        host=0x7fffffffe27b "foobaz.internal.example.com,X.Y.Z.W")
        at ../ssh-keyscan.c:613
    #9  0x00007ffff7f87d44 in main (argc=6, argv=0x7fffffffe778)
        at ../ssh-keyscan.c:779

This is the 20150127 snapshot, still. There seem to be a number of
places in ssh_packet_read_seqnr() where connection errors lead straight
to an exit...

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